Hello,
I know how important it is to see all of your bank transactions appearing in your QuickBooks Online Bank Feed. The Bank Feed helps to keep you organized by automatically uploading your transactions each night. I'd be happy to explain why you may not see some of your transactions until Monday.
The Bank Feed is updated each evening so that your account is up-to-date. It's important to keep in mind that some banks are closed on Sundays, which may impact how soon your transactions are appearing in QuickBooks Online. Transactions typically appear within one business day, however the weekend wouldn't be considered a business day if your bank is closed on Sundays.
I hope this helps. If the issue persists during weekdays, I'd encourage you to reach out to our tech support team.
Cheers.